Optical EngineeringTriple-clad single-mode fibers for dispersion flattening
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A design procedure for triple-clad dispersion-flattened single-mode fibers is developed. Following this procedure, fibers are identified that have lower dopant concentrations in the core than those of previous dispersion-modified fiber designs, a second-mode cutoff wavelength close to the lower operating wavelength of 1300 nm, zeros of dispersion at 1300 and 1550 nm, a small bending loss at 1550nm (for a bend radius of 5.0 cm), and spot sizes that are large enough not to compromise the splicing loss.